Adjustable Phase-Inverting Coupling Loop for Cavity Resonators
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Solution Overview
Problem
Conventional coupling structures for cavity resonators in filters face limitations, such as incorrect phase relationships in inductive couplings and lack of fine-tuning capabilities, making them unsuitable for high-power applications and adjustable filters.
Innovation Solution
The introduction of a quasi-capacitive coupling structure that couples magnetic portions of neighboring cavity resonators, maintaining correct phase relations and allowing for adjustable coupling strength through rotation, enabling precise tuning of filter responses.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If conventional inductive coupling structures are used to couple cavity resonators, then coupling between resonators is achieved, but incorrect phase relationships are generated between signals in the coupled resonators
Solution Approach 1:
The patent inverts the conventional coupling approach by using electric field coupling instead of magnetic field coupling. The coupling structure includes electric field coupling elements positioned to couple the electric fields of adjacent cavity resonators, which generates correct phase relationships between signals in the coupled resonators, opposite to the conventional inductive coupling method.
2Ease of operation
If conventional coupling structures are used in adjustable filters, then filter functionality is achieved, but fine-tuning capabilities are lacking
Solution Approach 1:
The patent implements a rotatable coupling structure that can be dynamically adjusted to different angular positions. The coupling strength between adjacent cavity resonators is controlled by rotating the coupling structure around an axis, allowing continuous adjustment of the filter response. This dynamic adjustment mechanism enables fine-tuning of the filter characteristics.
Solution Approach 2:
The patent changes the coupling parameter by varying the angular position of the coupling structure. As the coupling structure rotates, the effective coupling area and coupling strength change, allowing precise control over the filter response characteristics. This parameter change approach enables accurate tuning of the filter.
3Reliability
If cavity resonators are used for high-power applications, then high Q-factor and low surface current density are achieved, but conventional coupling structures become unsuitable
Solution Approach 1:
The patent introduces an intermediary coupling structure that bridges adjacent cavity resonators. The coupling structure includes coupling elements positioned at the interfaces between cavities, allowing energy transfer between resonators while maintaining the high-power handling capabilities of the cavity resonators. This intermediary structure makes high-Q cavity resonators compatible with coupled-resonator filter configurations.
Applied Scientific Principles
This section explains which scientific principles are used to turn an abstract innovation direction into a practical engineering solution.
Function Achieved in This Case
This solution provides accurate and efficient tuning of filter responses, overcoming the limitations of conventional coupling structures by maintaining phase relations and enabling precise adjustments in high-power applications.
Implementation Method 1
conventional inductive or magnetic coupling structures
Implementation Method 2
couples magnetic portions of neighboring cavity resonators, maintaining correct phase relations
Data Source
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AI summary
A conductor is formed of a first portion to define a first area in a plane that is substantially perpendicular to a first magnetic field direction in a first cavity resonator and a second portion to define a second area in a plane that is substantially perpendicular to a second magnetic field direction in a second cavity resonator. Inductive current generated in the first portion flows in substantially the same direction as current in the second portion. The conductor may be deployed in an aperture between the first and second cavity resonators to couple or cross-couple the first and second cavity resonators. The conductor may also be deployed to couple or cross-couple cavity resonators in a filter implemented in a broadcast-or base station.